@color: #4D926F;

#header {
  color: @color;
  display: flex;
  background:#333;
  width:30px;
}
h2 {
  color: @color;
  width:200px;
}
.mark{
  background:blue;
  width:30px;
  height:50px;
  border:1px solid #ccc;
}